That is a good question for their customer support contact form. I check their FAQ and it had only two questions! Just two? Yes.
I did find a note that said Adobe was required for downloading and printing any corrections to patterns. The sample issue is provided via Adobe Flash player. I don't think you can download that, but it does let you print pages from it. It had a rather nice print interface that let you check mark the pages you wanted to print.
Oh, on the page you linked is the following quote:
With Creative Knitting digital, you get immediate and free delivery of each issue, the ability to save and reference your issues anytime and anywhere (online and offline), and a paperless reading experience with high-resolution quality!
I added the emphasis to point out it says save and offline. That means (IMHO) you can download to your own computer and view and print anytime from there. [SIZE="1"]Copyright restrictions still apply.[/SIZE]